Eye of etlich testing

So i found an eye of etlich, and while testing, i was consistently getting a weird duration, 17 seconds.
Im guessing something is wrong, but i have tried with no equipment on besides the amulet, and only resistance and +dex charms in my inventory.
I am a cold sorc, and the only reason for the weird duration i could think of, was that cold mastery somehow interferes, does anyone know whether this is the case?